#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

#define rep(i, a, b) for(ll i = (ll)a; i < (ll)b; i++)
#define irep(i, v) for(auto i = (v).begin(); i != (v).end(); i++)
#define ALL(v) (v).begin(), (v).end()
#define SZ(v) (ll)(v).size()

const ll INF = 1e18;
const ld EPS = 1e-10;

ll f(ll a, ll b, char op){
  if(op == '+') return a + b;
  else return a * b;
}


int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  srand((unsigned)time(NULL));
  cout << fixed << setprecision(20);

  string s;
  cin >> s;
  ll n = SZ(s);
  for(ll i = 0; i < n; i++){
    s[i] = ((s[i] - 'A') - (i + 1) + 26 * 100000) % 26  + 'A';
  }
  cout << s << endl;



  return 0;
}